Machine for removing lining from



April 6, 1954 H. K. BIGELOW 2,674,309

MACHINE FOR REMOVING LINING FROM BRAKE SHOES Filed Feb. 11, 1950 I 5 Sheets-Sheet l @SGW A ril 6, 1954 H. K. BIGELOW MACHINE FOR REMOVING LINING FROM BRAKE SHOES Filed Feb. 11, 1950 3 SheetsShee t 2 "g 9 INVENTOR.

April 6, 1954 H. K. BIGELOW 2,674,309

MACHINE FOR REMOVING LINING FROM BRAKE SHOES Filed Feb. 11, 1950 s Sheets-Sheet s Fig. 11

IN VEN TOR.

Patented Apr. 6, 1954 MACHINE FOR REMOVING LINING FROM BRAKE SHOES Harry K. Bigelow, Columbus, Ohio Application February 11, 1950, Serial No. 143,734

4 Claims.

This invention relates to a machine for removing lining from a brake shoe or the like. In general, the machine comprises a supporting member or mandrel having means for mounting a brake shoe on the periphery with the lining uppermost. A cutting member, in the form of an adjustable blade, is mounted on the machine so that the blade engages the lining. Movement of the brake shoe relative to the cutting member causes a cutting action which strips or peels the lining away from the brake shoe.

One of the objects of the invention is to construet the machine with the mandrel having a slotted opening extendin around the entire periphery. This opening in the mandrel provides for receiving the web of the brake shoe, so that the brake shoe flange rests on the surface of the mandrel with the lining uppermost. This construction facilitates mounting the brake shoe in operating position with a minimum of time and effort.

In one embodiment of the invention the brake shoe is held in position on the mandrel with a removable pin. This pin extends through the sides of the mandrel in a position to engage the web at one end of the brake shoe. Thus, when the brake shoe is mounted with the web in the slotted opening, the pin can be inserted in a position to abut against one end of the web and provides a driving member which carries the brake shoe around with the mandrel as the latter rotates.

In another embodiment of the invention the driving pin is replaced with a pawl type of gripping member. A pivotally mounted arm carries the pawl and can be swung so as to grip the brake shoe. The pawl thus provides for moving the brake shoe and the mandrel to effect a cutting action of the cutting member with the lining.

Another object of the invention is to provide the machine with members, which can be in the form of rollers under spring tension, and which are positioned to hold the brake shoe while the cutting member engages the lining. Thus, when the brake shoe is brought into position for the cutting member Or blade to engage the lining, the force of the cutting action can not lift or twist the brake shoe on the mandrel. One of the advantages of this construction resides in the fact that continued movement of the brake shoe past the cutting member and rollers carries the brake shoe around to a position where the brake shoe, with the lining removed, can drop freely from the mandrel.

A further object is to provide the machine with an adjustably mounted cutting blade, which can be adjusted to the angle best suited to cut or peel away the particular type and thickness of lining carried on the brake shoe, and with a minimum of power and time required. A cam on the periphery of the mandrel facilitates bringing the cutting blade into engagement with the lining. This cam also prevents the blade from striking the leading edge of the brake shoe flange as the mandrel rotates.

It is also an object to provide a machine of the type described which can be operated by either hand or mechanical power to remove the lining. Power can be applied either to drive the mandrel or, if preferred, the power can be connected to drive the hold-down rollers. With the latter construction, it is only necessary for the operator to place the web of the brake shoe in the slotted opening formed in the mandrel and move the brake shoe on the mandrel until the leading end engages under the first of the holddown rollers." Where the mandrel is driven, the operator holds the brake shoe in position until it is carried around to the point where the leading edge engages under the first hold-down roller. The brake shoe, with the lining uppermost, is fed from the first roller past the cutting member and engages the second hold-down roller while the lining is being removed.

An additional object is to provide the machine with an abrasive element, preferably in the form of a wheel, which can b mounted in a position to engage the surface of the brake shoe after the lining has been cut or stripped away to provide for cleaning or roughening that surface in preparation for securing a new lining thereon. The abrasive element or wheel can be mounted between the hold-down rollers. In the preferred construction however, a third hold-down roller is provided to hold the brake shoe on the mandrel while the flange is being roughened.

A still further object is to provide a machine having the features described which can be compactly and ruggedly constructed, which is adaptable for either hand or power driving, and which provides for fast, economical and safe operation without a high degree of skill bein required.

Other objects and advantages of the invention will be apparent from the following description, the appended claims, and the accompanying drawings wherein preferred forms of the invention are shown.

In the drawings:

Fig. 1 is a side elevational View of a machine constructed in accordance with one form of the invention;

Fig. 2 is an end elevational view of the machine shown in Fig. 1;

Fig. 3 is a partial, vertical sectional view through the brake shoe and mandrel and showing the pin used to retain the brake shoe on the mandrel for a machine constructed as illustrated in Fig. l

Fig. 4 is a partial, top elevational view showing the brake shoe mounted on the mandrel and held by the pin shown in Fig. 3;

Fig. 5 is a partial, side elevational view of the blade andadjusting mechanism for controlling:

the blade angle relativeto the lining;

Fig. 6 is a side elevational view of a modified construction of the machine in which the hand lever for rotatin the mandrel is replaced witha power drive and an abrasive wheel'is provided to roughen the surface of the brake shoe after the lining is removed;

Fig. '7 is a side elevational viewof the machine with a modified mandrel construction and a hand operated lever for moving the brake shoe around the periphery of the mandrel;

Fig. 8 is an end elevational view-ofthe machine shown in Fig. 7;

Fig. 9 is a view similar to Fig. 7. showing in full lines the position of the operatinghandle gripping the brake shoe to provide vfor moving the same part way past the cuttingmember and in dotted lines the position of the handle for completing the movement of the brakeshoe;

Fig. 10 is a side elevational viewof. the machine shown in Fig. '7 with the operating; handle removed, a power drive connected todrive the two hold-down rollers, and'an abrasivewheel provided to roughen the surface of the. brake shoe after the lining is removed; and

Fig. 11 is aview similar to Fig.10-showing a power drive connected to drive the mandrel in place of the hold-down rollers.

Referring further to the drawings, in Fig. 1 the machine is shown witha frame l2 having side arms l3 and M, Fig. 1, and vertically extending side members |5and I6, Fig. 2.

The frame l2 supports the. drum member or mandrel l9. This mandrel is carried on the axle which is rotatably mounted between the side members I5 and I6 as seen .in Fig. 2. The mandrel is formed witha slotted opening 2| which extends around the entire periphery of the mandrel, and provides aseat for receiving the web 22 of the brake shoe 3. The opening 2| is of a depth to permit the flange 23 of the brake shoe to rest on the outer surface of the mandrel, with the lining 24 uppermost, as shown in Figs. 3 and 4. To mount the brake shoe in operating position on the mandrel, the operator places the shoe with the web in the opening 2|-. A pin 21 is then inserted through circular openings provided in the sides of the mandrel, asillustrated in Fig. 4,

and forms latching means for, holdin the brake shoe in place on the mandrel. Pin 21 abuts against the trailing end 28 of the Web and serves as a driving member. Thus when the mandrel is rotated the brake shoe is carried around with the mandrel.

A cutting member 3Dis mounted in a position to engage the surface of the lining 24 for cutting or peeling the lining away from the flange 23 of the brake shoe. This cutting member includes an arcuately formed blade 3|, Fig. 5, which is pivotally connected'to the cross rod 32mounted between the side members l5 and' I6, Fig. 2. The blade 3| is pulled down to the surface of thelining with a coil spring 33, Fig. 1, having one end fastened to the blade and the other end fastened to one of the side members. The angle at which the blade 3| cuts is adjustably controlled bythe micrometer mechanism indicated generally at 34 in Fig. 1. This mechanism includes a pair of side arms 35 and 36, Fig. 2, pivotally connected to the cross rod 3'! carried by the blade 3|; A roller 38 is mounted betweenthe arms 35 and 36 in a position to ride upon the upper surface of the flange 23 when the blade engages the lining.

The micrometer 34, Fig. 5, connects between the arms and the blade to providefor accurately controlling the position of the blade relative to the arms 35 and 36 and thereby the angle at which the blade cuts with respect to the flange surface of. the brake shoe. In Fig. 1 the blade is shown adjusted to a position i. e. cutting angle to remove the entire lining with a single rotation of the mandrel. It will be readily apparent to those skilled in this art that the blade can be adjusted to a position to cut away less than the entire thickness of the lining if so desired.

A cam 39 on the surface of the mandrel provides for raising blade 3| and the roller 38. Cam 39 is of sufficient height and positioned to prevent blade 3| from striking the leading edge of flange. 23, as the mandrel rotates, in the event the blade. has been adjusted too low. After the blade and roller pass over the cam the blade is free to drop down. This movement allows the blade to dig into the lining i. e. cut down to the surface between the lining and flan e 23.

of the brake shoe, a plurality of holes 40, Figs. 1 and 6, are spaced around the periphery of the mandrel which extend through the sides and into the slotted opening 2|. be placed through one of the holes to form an abutment against which the leading edge of the web 22 engages. This construction provides for properly. spacing the brake shoe from the cam regardless of the type of brake shoe, 1. e., for example, one havin a long leading web with the lining terminating short of the leading edge as compared to a brake shoe having a short or receding type of web with the lining terminating at the leadingedge as indicated generally in the drawings.

Means are provided for releasably holding the brake shoe on the mandrel while the cutting member engages the lining. In Fig. 1, the means provided for this purpose is a pressure applying member in the form of a roller 4| positioned'in front of blade 3|. The roller is carried at the end of arm 42 in a position to ride upon the lining 24, as seen in Fig. 1. The arm 42 is, in turn, pivotally connected to the outer end of arm l4. A coil spring 43 provides for holding the roller against the lining with sufilcient force to prevent the cutting action of the blade against the lining from raising or twisting the brake shoe on the mandrel.

As the mandrel turns in the directionof the arrow 46, Fig. l, the leading edge 25 of the brake shoe moves past the cutting edge of blade 31. The lining 24 is cut away from the surface of the flange 23, and the leading edge is carried around to the roller 48 positioned to the rear of blade 3|. This roller is similar in construction and mounting to roller 4|. That is, roller 48 is carried at the end of arm 49 which, in turn, is pivotally mounted on the outer end of arm l3.- A coil spring 50 provides for holding roller 48 under tension. Roller 48 is, in the preferred construction, spaced around the periphery i. e. to the rear of the cutting member 30 to provide a second hold-down member for the brake shoe which engages the flange while roller 4| is still in contact with the lining.

A hand operating lever 52 is connected to a crank arm 53 on the axle 20. A spring pressed pin 54' provides for adjustably positioning the lever on the crank arm. In operation, when'the operator pulls down on the lever, asviewed in Fig. 1, the mandrel is rotated in the direction of To insurev proper spacing of the cam from the leading edge.

A removable pin 44 can.

the arrow 46. This movement of the mandrel carries the leading edge 25 of the brake shoe under the roller 4|. The lining 24 is then brought into engagement with the blade 3| which strips or peels the lining away from the flange of the brake shoe. Further rotation of the mandrel carries the leading edge around until the roller 48 rides upon the surface of the flange from which the lining has been removed. The engagement of the rollers 4| and 5.9 on the brake shoe, while the cutting action proceeds, prevents the brake shoe from lifting or twisting on the mandrel. Continued rotation of the mandrel carries the brake shoe around until the trailing edge 28 passes the roller 48. The brake shoe is then in a, position to drop freely from the mandrel and another brake shoe can be positioned thereon to repeat the operations.

In the modified construction shown in Fig. 6, the hand operating lever 52 has been removed and the mandrel is rotated by a belt power drive, not shown, connected in the usual manner to a gear 56 carried on the axle 20. There is also provided an abrasive element in the form of a wheel 51'. This wheel is mounted on the frame with a bracket, not shown, and can be driven from the same power source as the mandrel. Wheel 51 is adjustably mounted between the rollers 4| and 4B and can be positioned to engage the surface of the flange, after the lining has been removed, to provide for roughening or cleaning that surface to facilitate securing a new lining thereon.

In Fig. 7 the mandrel 6| is constructed with a slotted opening 62 extending around the entire periphery of the mandrel. This mandrel is 1'0- tatably mounted on a shaft 63 carried by the supporting plate 64. As seen in Fig. 8, plate 64 is provided with angle iron supports 65 to facilitate mounting the plate in a vertical position on a work bench or the like.

A pair of blocks 61 and 68 are mounted on plate 64, each block being held with a bolt and nut, as indicated at $9, which extends through the slotted opening 19. Each of the blocks 61 and 68 has a block H and 12, respectively, mounted thereon with a pivotal connection I3. The blocks H and 12 each have a threaded bolt 14 extending through the upper end, Fig. '7. A compression spring engages between the head of bolt 14 and a stop member 16. This spring provides a force which tends to swing the blocks 7 H and 72 about their pivots T3. The stop memfbers l'i limit the extent of movement of the blocks H and I2. A serrated roller 18 is mounted on block H in a position to ride on the surface of the lining 29 as shown in Fig. 9. A serrated roller i9 is similarly mounted on block 12, but its position is adjusted to provide for the roller riding on the flange where the lining has been removed. In operation, this position of roller 18 is adjusted by moving block Bl within the limits permitted by slot it. Roller 19 is positioned by moving block 63. Adjustments of the bolts 14 control the tension of springs '15 and the amount of pressure exerted by the rollers 18 and 19.

The cutting member, indicated generally at 8| in Fig. 7, comprises a block 82 mounted on the plate 64 with a bolt and nut 83 extending through the slot 84. The blade 85 is carried on the flanged edge of block 82, as shown in Figs. '7 and 9. The block can be raised or lowered on the plate 64, to the extent permitted by the slot 84, to adjust the cutting position of the blade relative to the lining.

A hand operating lever 9| is pivotally connected to the end of shaft 63 to provide for driving the brake shoe and the mandrel. A pawl type of gripping member, indicated generally at 92, is carried on the side of the lever for this purpose. As seen in Fig. 7 this member includes a block 93 fastened to the lever 9|. A leaf spring 94 is connected at one end to the block 93 and carries a pawl 95 at its other end. A stop block 96 fastened to the lever 9| increases the spring tension when force is applied to move the spring into engagement with block 96. The spring tension thus provided holds the pawl in the locked or engaging position when it grips the lining 24. In the preferred construction shown, the leaf spring 94 and pawl 95 are mounted on the upper side of block 93. Thus, when the lever 9| is in the full line position of Fig. 9, and moved in the direction or arrow 91, pawl 95 digs into the surface of the lining 24 as shown and full leverage can be applied to move the brake shoe. When the lever B! is first moved to bring the pawl 95 into contact with the lining, the operator manually raises i. e. springs, the pawl so that its lower or inner end will clear the trailing edge of the flange 23 and lining 24 and engage the lining in the position shown. Further upward movement of lever 9| then causes the pawl to dig into the lining.

In operating the machine shown in Fig. '7, the brake shoe is placed on the mandrel 6| with the web in the slot 62. Lever 9| is swung in the direction of the arrow 91 until the pawl 95 engages the surface of the brake lining. Further movement of the lever 9| in the same direction pushes the brake shoe under the roller l8 and past the blade 85. The blade is adjusted to strip off the lining 24 as seen in Fig. 9. The arc, through which the lever 9| swings, in the direction of the arrow 91, is sufficient to move the brake shoe around the mandrel until the leading edge passes under the roller '59. When further movement of lever 9| in the direction of arrow 91 is stopped, by contact of the lever with roller 18, lever 9| is swung in the reverse direction i. e. opposite to that of arrow 9|. This movement releases the pawl with respect to the lining and permits the lever 9| to be moved to another position to regrip the lining. The lever can then be fed through the machine with repeated short strokes of lever 9| in the manner described if so desired.

A modified construction of the lever 9| is shown in Fig. 9. The lever is extended in length and a second gripping member, indicated generally at 98, is mounted thereon. The gripping member 98 is similar in construction to member 92, and provides for gripping the surface of flange 23 when lever 9| is moved to the dotted line position shown in Fig. 9. Then, when the lever is again moved in the direction of arrow 91, the brake shoe is pulled on around to complete the cutting action.

The machine illustrated in Fig. '7 can be modifled, as shown in Figs. 10 and 11, if it is desired to replace the hand operation with a power drive. In such case the hand operating lever 9| is removed. In Fig. 10 power is applied through the gear I00, driven by the belt Hill, to drive the roller 18. Roller 19 is driven by the gear |03 from belt ID! in the usual manner. Also, if desired in this modification, the abrasive wheel 51 is mounted to provide for roughening the surface of the flange after the lining has been removed, as previously described. The mandrel 7 6|; rollers 18. and I9, and'wheel;,-5'I are-a1l rotated in the direction of the arrows as shown in Fig. 10. In this construction a third hold-down edge of the brake shoeis gripped by.roller member I04 while the trailing edge is being gripped,

by roller I9.

In Fig. 11 power is applied to drive the mandrel 6|. A gear I05, driven by the belt I06, is provided to supply the driving power; The abrasive wheel51 can also be used in this modification, as shown, if desired. Power is supplied to drive the wheel 51 in the usual manner.

In operating either of ,the machines shown in; Fig. 10 or Fig. 11, it is only necessary forthe op erator to place the brake shoe on the mandrel. The operator holds the brake shoe on the mandrel'until the leading edge is gripped under the roller I8. After thelining is removed and the trailing end of the brake shoe passes the roller member I04, the brake shoe drops from the mandrel.

From the above description it will be apparent that the machine is constructed and operates to accomplish the objects and advantages set forth. However, while the embodiments of the invention disclosed herein constitute preferred 5 forms, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

I claim:

1. A machine for removing lining from a brake shoe comprising a supporting, member for a shaft; a mandrel rotatably mounted .onsaid shaft having an arcuate surface provided with means for mounting a brake shoe on the periphery thereof; a cutting member mounted on said supporting member adjacent the mandrel having a cutting edge substantially tangential to said surface and in a position to engage the lining of the brake shoe to provide for cutting. the-lining away from the brake shoe; pressure applying means mounted on said supporting member next to the cutting member and adjacent said arcuate surface in a position to engage the upper surface of the brake shoe to provide for releasably holding the brake shoe on the mandrel While the cutting member. engages the lining; means for resiliently urging said pressure applying means toward said arcuate surface; and a hand operating lever connected to said shaft for rotating the mandrel having a gripping member mounted thereon adjacent the mandrel and in position to engage the brake lining for driving said brake shoe with the mandrel to provide, relative. movement between the brake shoe and the cutting member causing a cutting action to be produced on the lining for removing the-same from-the brake shoe.

2. A machine for removing lining from a brake shoe comprising a supporting member having a rotatably mounted mandrel with anarcuate surface formed with a slot adapted to receive the brake shoe web; a cutting member mounted on said supporting member adjacent the mandrel having a cutting edge substantially. tangential to said surface to provide for cuttingthe liningaway fromthe brakeshoe; a pair of,pressur,e applying members mounted on said, supporting. member, one on each side of said cutting member and adjacent said arcuate-surface in a position to engage the upper surface of the brake shoe to pro.-

vide for releasably holding the-brake shoe on the mandrel while the cutting member engages the lining; means for resiliently. urging each of said pressure applying members towardsaid arcuate brake shoe and the cutting. member causing a cuttting action to be produced on the lining for.

removing the same from thev brake shoe.

3. A machine for removing lining froma brake shoe comprising a supporting member having a rotatably mountedmandrel with an arcuate surface formed with a slot adapted to receive the brake shoe web; a cutting member mounted on said supporting member adjacent the mandrel having a cutting edge substantially tangential to said surface to provide for cutting the lining away from the brake shoe; a pressure applying roller, mounted on said supporting member forwardly of the cutting member and adjacent said arcuate surface to engage the lining of the brake shoe in advance of the cutting member; a second pressure applying roller mounted on said supporting member rearwardly of the cutting. member and adjacent saidarcuate surface to engage the upper surface of the brake shoe after the lining has been removed therefrom; means for resiliently urging said rollers toward said arcuate surface and means applying power to rotate the mandrel.

4. A machine for removing lining from a brake shoe comprising a supporting member having a rotatably mounted mandrel with an arcuate surface formed. with a slot adapted to receive the brake shoe web; a cutting member mounted on said supporting member adjacent the mandrel having a cutting edge substantially tangential to said surface to provide for cutting the lining away: from the brake shoe; pressure applying means mounted on said supporting membernext to the cutting member. and adjacent said arcuate surface-in a position to engage the upper surface of the brake shoe to provide for: releasably holding the brake shoeon the mandrel while the cutting member engages the lining; means for resiliently urging. said pressure applyin means toward said arcuate surface and means applying power to rotate the mandrel.

References Citedinthe file of this patent UNITED STATES PATENTS Number Name Date 248,525 Stowe Oct, 18, 1881 622,906 Watson. Apr. 11, 1899 1,127,512 Prims Feb. 9, 1915 1,554,302 Slyder Sept. 22, 1925 1,653,104 Kimmerling Dec. 20, 1927 1,701,889 Junker Feb. 12, 1929 1,786,542 MacDonald Dec. 30, 1930 1,940,474 Whitworth Dec. 19, 1933 2,583,161v Urbano Jan. 22, 1952 FOREIGN PATENTS Number Country Date 837,544 France Nov. 12, .1938 

